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A149867 as a simple table

na(n)
01
12
25
313
440
5134
6467
71681
86230
923698
1091781
11361474
121444421
135838953
1423855627
1598385021
16409057415
171713260510
187223645090
1930637979060
20130649823315
21559905201444
222410332888720
2310419393878406
2445214717684925
25196904962166692
26860326758933089
273770559907597927
2816572613244060271

[1,2,5,13,40,134,467,1681,6230,23698,91781,361474,
 1444421,5838953,23855627,98385021,409057415,
 1713260510,7223645090,30637979060,130649823315,
 559905201444,2410332888720,10419393878406,
 45214717684925,196904962166692,860326758933089,
 3770559907597927,16572613244060271]